Optical constants manipulation of formamidinium lead iodide perovskites: ellipsometric and spectroscopic twigging†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-08-26 DOI:10.1039/D4YA00339J
Mohd Taukeer Khan, Muhammed P. U. Haris, Baraa Alhouri, Samrana Kazim and Shahzada Ahmad
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Abstract

Unraveling the knowledge of the complex refractive index and photophysical properties of the perovskite layer is paramount to uncovering the physical process that occurs in a perovskite solar cell under illumination. Herein, we probed the optical and photophysical properties of FAPbI3 (FAPI) and Cs0.1FA0.9PbI3 (CsFAPI) thin films deposited from pre-synthesized powder, by the spectroscopic ellipsometer and time-resolved fluorescence spectra. We determined the complex refractive index of perovskite films by fitting the measured spectroscopic ellipsometer data with the three-oscillator Tauc–Lorentz (T–L) model. We deduced that the CsFAPI thin film had a slightly lower absorption coefficient than the FAPI, but a higher refractive index and dielectric constant than the FAPI. The peak photoluminescence (PL) emission of FAPI and CsFAPI thin film on glass substrates was observed around 803 nm and 799 nm, respectively, while on ITO substrates, both FAPI and CsFAPI thin film was quenched and red-shifted to 816 nm. The methylammonium free pure CsFAPI-based perovskite solar cell fabricated in p–i–n configuration, measured a competitive efficiency of 16.14%, characterized by a JSC of 23.995 mA cm−2, VOC of 912 mV, and FF of 73.74%.

Abstract Image

Abstract Image

操纵甲脒碘化铅包晶石的光学常数:椭偏和光谱分析。
了解透辉石层的复杂折射率和光物理性质对于揭示透辉石太阳能电池在光照下的物理过程至关重要。在此,我们通过光谱椭偏仪和时间分辨荧光光谱,探测了由预合成粉末沉积而成的 FAPbI3 (FAPI) 和 Cs0.1FA0.9PbI3 (CsFAPI) 薄膜的光学和光物理性质。我们用三振子陶克-洛伦兹(T-L)模型拟合光谱椭偏仪的测量数据,从而确定了包晶薄膜的复折射率。我们推断 CsFAPI 薄膜的吸收系数略低于 FAPI,但折射率和介电常数高于 FAPI。在玻璃衬底上,FAPI 和 CsFAPI 薄膜的光致发光(PL)峰值分别在 803 纳米和 799 纳米附近,而在 ITO 衬底上,FAPI 和 CsFAPI 薄膜均被淬灭并红移至 816 纳米。以 pi-n 配置制造的不含甲基铵的纯 CsFAPI 型过氧化物太阳能电池测得的竞争效率为 16.14%,J SC 为 23.995 mA cm-2,V OC 为 912 mV,FF 为 73.74%。
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CiteScore
1.80
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